Igneous Rocks Igneous Rocks Chapters 3 & 4 Arcadia Nat’l Park, Maine.
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Transcript of Igneous Rocks Igneous Rocks Chapters 3 & 4 Arcadia Nat’l Park, Maine.
![Page 1: Igneous Rocks Igneous Rocks Chapters 3 & 4 Arcadia Nat’l Park, Maine.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e375503460f94b27810/html5/thumbnails/1.jpg)
Igneous RocksIgneous Rocks Igneous RocksIgneous RocksChapters 3 & 4Chapters 3 & 4Chapters 3 & 4Chapters 3 & 4
Arcadia Nat’l Park, Maine
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How do Igneous Rocks form?
What is Magma?
What is Lava?
How do they form?
• What are the two categories of igneous rocks?What are the two categories of igneous rocks?
• How does each type form?How does each type form?
How are plutons & volcanoes related?
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How Hot Is Lava?
• How long does it take lava to cool?
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Where Does Magma Originate?
Where are Magma Chamber located?Where are Magma Chamber located?
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How does pressure affect the melting point of a rock?
What is the Geothermal gradient?
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How does water affect rocks at depth?
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TEXTURES of Igneous Rocks
• What is Texture?
• What does a rock’s grain size indicate?
What is Aphanitic texture and what does it indicate?
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• What is Glassy texture & what does it indicate?
• What is Vesicular texture & what does it indicate?
a b
TEXTURES of Igneous Rocks (cont.)
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What is Phaneritic texture & what does it indicate?
TEXTURES of Igneous Rocks (cont.)
![Page 10: Igneous Rocks Igneous Rocks Chapters 3 & 4 Arcadia Nat’l Park, Maine.](https://reader035.fdocuments.us/reader035/viewer/2022062717/56649e375503460f94b27810/html5/thumbnails/10.jpg)
• What is Porphyritic texture & what does it indicate?
TEXTURES of Igneous Rocks (cont.)
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• What is Pyroclastic (fragmental) texture & what does it indicate?
TEXTURES of Igneous Rocks (cont.)
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What is the most abundant constituent of magma?What is the most abundant constituent of magma?
• What characteristics do Felsic magmas have?
• What characteristics do Intermediate magmas have?
• What characteristics do Mafic magmas have?
• What characteristics do Ultramafic magmas have?
Magma CompositionMagma Composition
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Composition of Igneous Rocks• What controls the type of rock that forms?
What are the 4 Magma Modification Processes?
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What is Crystal settling?
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What is Assimilation?
How does it affect a magma’s composition?
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• What is Magma mixing & how does it affect a magma’s composition?
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Who discovered Bowen’s Reaction Series?
What is Bowen’s Reaction Series?
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How are Igneous Rocks Classified?
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A B
• Felsic are _______ colored b/c they’re composed of orthoclase, Na-plagioclase, & quartz.
Rhyolite (A) Granite (B) [most common intrusive rock]
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Pegmatites are __________________ (grains >1 cm in diameter) & are mineralogically similar to ______.
• These mineral grains crystallized from ______________
____________________________________________.
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Intermediate contain _________ amts of _________ colored ferromagnesian silicates, & _________ colored feldspar.
Andesite (A) Diorite (B)[erupts from island arcs]
A B
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Mafic rocks are ______colored b/c they’re largely composed of ______________________________________.
Basalt (A) Gabbro (B)
A
B
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Ultramafic are _____ colored b/c they are comp. of ________________________________ silicates.
What are Peridotites composed of olivine?
Where are Peridotites formed?
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What rock type has a similar composition?
Why can volcanic glass be different colors?
What are vesicles & how are they formed?
What is Volcanic Glass composed of?
PumiceObsidian
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What are Tuffs?
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What are the Magma Types at Convergent Margins?
How are these magmas
formed?
How do magmas move?
What is Magma type at Divergent Margins & Hot Spots?